Malicious PDF — malware analysis report

Static analysis result for SHA-256 960c8836010f99e2…

MALICIOUS

PDF

72.6 KB Created: 2021-02-26 01:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 70583c4462b0685b98f9a635aa83c2fb SHA-1: e197787c822d1435ae03b42a85b462ec9a29e269 SHA-256: 960c8836010f99e2ad0a923d73b0c2f37bc4d5747be8216c927b0aee96ea69f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=guitar+songs+tabs+acoustic PDF link annotation
    • http://peromopativej.mypressonline.com/salvation_army_christmas_assistance_frederick_md.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_600f314ca7442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6019c5bd558a1.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/fasofoxigatafis.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/jowulatawi.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/3584c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409630/normal_5fefadac95ac6.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/16445.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/gesimizaluzoxet_jafagilobum_fajori.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/a69dc42d.pdfIn PDF document text
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/mexesalaloka_wadasiwovigiv.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/romavujol.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/numulalok.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/142495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/97803246623.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/51206633857.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 5108 bytes
SHA-256: 52e460ab39503ceb3bd868ee56829710e0c19811b1686229a7cb88cfcfb11e0b
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10236 bytes
SHA-256: 11bed5a10f28bfa3d419a3e8ccc974e407bfe8669f86c75ea8362e6ee79fc75e

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